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Mach's [[microkernel/mach/external_pager_mechanism]].

Mach [[microkernel/mach/IPC]]'s [[microkernel/mach/ipc/sequence_numbering]].

[GNU Hurd Reference Manual: 4.2 Pager
Library](http://www.gnu.org/software/hurd/doc/hurd_5.html#SEC32).